- "In the Name of the Son: The Making of a Serial Killer" (2014)
- "The Prince of Shadows" (2009)
- "The Last Executioner: The Life and Death of England's Most Infamous Hangman" (2017)
- "The Dark Apostle: The Life of Dr. Josef Mengele" (2018)
- "Shadows of the Shadow Men" (2019)
- "The Devils' Game" (2019)
- "The Brotherhood of Shadows: The Inner Workings of the Illuminati" (2020)
- "The Secret Language of Psychopaths: How to Spot a Dangerous Person Before It's Too Late" (2021)